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Ratcheting convective cells of sand grains around offshore piles under cyclic lateral loads

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Abstract

Sand densification around the pile has traditionally been regarded as an explanation for the grain migration and soil subsidence that often occur around cyclic laterally loaded piles embedded in sand. Supported by new empirical evidence, this paper proposes that, additionally to some soil densification around the pile, the main cause for the continuous “steady-state” grain migration is a convective cell flow of sand grains in the vicinities of the pile head. Such convective flow would be caused by a ratcheting mechanism triggered by the cyclic low-frequency lateral displacements of the pile. Furthermore, the experimental results suggest that the limit between the convective cell and the static soil is marked by a distinct direct shear surface. This might shed some light into the complex phenomena related to the pile-soil interaction in the upper layers of the bedding, which are normally the main contributor for the lateral load-bearing capacity of piles.

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Authors and Affiliations

  1. BAM, Bundesanstalt für Materialforschung und -prüfung (Federal Institute for Materials Research and Testing), Division VII.2 “Buildings and Structures”, Unter den Eichen 87, 12205, Berlin, Germany

    Pablo Cuéllar, Matthias Baeßler & Werner Rücker

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  1. Pablo Cuéllar
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  2. Matthias Baeßler
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  3. Werner Rücker
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Correspondence to Pablo Cuéllar.

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This article contains many references to the colour features of the presented test, which won’t be appreciable in the greyscale of the figures. The full colour version of all the figures can be viewed in the on-line version of the paper.

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Cuéllar, P., Baeßler, M. & Rücker, W. Ratcheting convective cells of sand grains around offshore piles under cyclic lateral loads. Granular Matter 11, 379 (2009). https://doi.org/10.1007/s10035-009-0153-3

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